气候变化领域集成服务门户(CCPortal): High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals

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DOI	10.1016/j.rse.2020.111725
	High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals
	Chong H.; Lee S.; Kim J.; Jeong U.; Li C.; Krotkov N.A.; Nowlan C.R.; Al-Saadi J.A.; Janz S.J.; Kowalewski M.G.; Ahn M.-H.; Kang M.; Joiner J.; Haffner D.P.; Hu L.; Castellanos P.; Huey L.G.; Choi M.; Song C.H.; Han K.M.; Koo J.-H.
发表日期	2020
ISSN	00344257
卷号	241
英文摘要	The Geostationary Trace gas and Aerosol Sensor Optimization (GeoTASO) instrument is an airborne hyperspectral spectrometer measuring backscattered solar radiation in the ultraviolet (290–400 nm) and visible (415–695 nm) wavelength regions. This paper presents high-resolution sulfur dioxide (SO2) maps over the Korean Peninsula, produced by SO2 retrievals from GeoTASO measurements during the Korea–United States Air Quality Field Study (KORUS-AQ) from May to June 2016. The highly sensitive GeoTASO instrument with a spatial resolution of ~250 m × 250 m can detect point emission sources of SO2 within its fields of view, even without merging multiple overlapping observations. To retrieve SO2 vertical columns from the GeoTASO measurements, we apply an algorithm based on principal component analysis (PCA), which is effective in suppressing noise and biases in SO2 retrievals. The retrievals successfully capture SO2 plumes and various point sources such as power plants, a petrochemical complex, and a steel mill, located in South Chungcheong Province, some of which are not detected by a ground-based in situ measurement network. Spatial distributions of SO2 from GeoTASO observations in source areas are consistent with those from the Stack Tele-Monitoring System reports and airborne in situ SO2 measurements. Comparisons of SO2 retrievals from GeoTASO and existing satellite sensors demonstrate the significance of high-resolution SO2 observations, by indicating that GeoTASO detects small SO2 emission sources that are not precisely resolved by single overpasses of satellites. To assess future geostationary SO2 observations having a higher spatial resolution, we upscale the GeoTASO SO2 retrievals to a spatial resolution of the Geostationary Environment Monitoring Spectrometer (GEMS). Since the upscaled GeoTASO retrievals also detect SO2 plumes clearly, we expect from GEMS to identify even small SO2 emission sources over Asia. © 2020
英文关键词	Airborne remote sensing; GEMS; GeoTASO; KORUS-AQ; PCA technique; SO2
语种	英语
scopus关键词	Air quality; Gems; Geostationary satellites; Image resolution; Petrochemical plants; Remote sensing; Small satellites; Spectrometers; Sulfur dioxide; Airborne remote sensing; Environment monitoring; GeoTASO; High-resolution mapping; Hyperspectral spectrometer; KORUS-AQ; PCA technique; Tele monitoring system; Principal component analysis; airborne sensing; algorithm; in situ measurement; principal component analysis; satellite sensor; solar radiation; spatial resolution; steel; sulfur dioxide; wavelength; Korea; South Chungcheong; South Korea; United States
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179377
作者单位	Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, South Korea; Earth System Science Interdisciplinary Center, University of Maryland, College ParkMD 20740, United States; NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; Atomic and Molecular Physics Division, Harvard–Smithsonian Center for Astrophysics, Cambridge, MA 02138, United States; NASA Langley Research Center, Hampton, VA 23666, United States; Goddard Earth Sciences Technology and Research, Universities Space Research Association, Columbia, MD 21046, United States; Department of Atmospheric Science and Engineering, Ewha Womans University, Seoul, 03760, South Korea; Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30318, United States; School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea
推荐引用方式 GB/T 7714	Chong H.,Lee S.,Kim J.,et al. High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals[J],2020,241.
APA	Chong H..,Lee S..,Kim J..,Jeong U..,Li C..,...&Koo J.-H..(2020).High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals.Remote Sensing of Environment,241.
MLA	Chong H.,et al."High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals".Remote Sensing of Environment 241(2020).